<template>
  <div class="singleImageUpload2 upload-container">
    <el-upload
      :data="dataObj"
      :multiple="false"
      :show-file-list="false"
      :on-success="handleImageSuccess"
      class="image-uploader"
      drag
      action="https://httpbin.org/post">
      <i class="el-icon-upload"/>
      <div class="el-upload__text">Drag或<em>点击上传</em></div>
    </el-upload>
    <div 
      v-show="imageUrl.length>0" 
      class="image-preview">
      <div 
        v-show="imageUrl.length>1" 
        class="image-preview-wrapper">
        <img :src="imageUrl">
        <div class="image-preview-action">
          <i 
            class="el-icon-delete" 
            @click="rmImage"/>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { getToken } from '@/api/qiniu';

export default {
    name: 'SingleImageUpload2',
    props: {
        value: {
            type: String,
            default: ''
        }
    },
    data() {
        return {
            tempUrl: '',
            dataObj: { token: '', key: '' }
        };
    },
    computed: {
        imageUrl() {
            return this.value;
        }
    },
    methods: {
        rmImage() {
            this.emitInput('');
        },
        emitInput(val) {
            this.$emit('input', val);
        },
        handleImageSuccess() {
            this.emitInput(this.tempUrl);
        },
        beforeUpload() {
            const _self = this;
            return new Promise((resolve, reject) => {
                getToken().then(response => {
                    const key = response.data.qiniu_key;
                    const token = response.data.qiniu_token;
                    _self._data.dataObj.token = token;
                    _self._data.dataObj.key = key;
                    this.tempUrl = response.data.qiniu_url;
                    resolve(true);
                }).catch(() => {
                    reject(false);
                });
            });
        }
    }
};
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
.upload-container {
  width: 100%;
  height: 100%;
  position: relative;
  .image-uploader {
    height: 100%;
  }
  .image-preview {
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0px;
    top: 0px;
    border: 1px dashed #d9d9d9;
    .image-preview-wrapper {
      position: relative;
      width: 100%;
      height: 100%;
      img {
        width: 100%;
        height: 100%;
      }
    }
    .image-preview-action {
      position: absolute;
      width: 100%;
      height: 100%;
      left: 0;
      top: 0;
      cursor: default;
      text-align: center;
      color: #fff;
      opacity: 0;
      font-size: 20px;
      background-color: rgba(0, 0, 0, .5);
      transition: opacity .3s;
      cursor: pointer;
      text-align: center;
      line-height: 200px;
      .el-icon-delete {
        font-size: 36px;
      }
    }
    &:hover {
      .image-preview-action {
        opacity: 1;
      }
    }
  }
}
</style>
